The anion/cation ratio refers to the ratio of the number of negatively charged ions (anions) to the number of positively charged ions (cations) in a compound. This ratio is important in determining the physical and chemical properties of the compound, such as its melting point and solubility.



The compound LiI is made up of lithium cations (Li+) and iodide anions (I-). The anion/cation ratio is calculated by dividing the number of iodide anions by the number of lithium cations. Since LiI has one lithium cation and one iodide anion, the anion/cation ratio is 1:1.



LiF is also made up of lithium cations and fluoride anions (F-). However, since LiF has one lithium cation and two fluoride anions, the anion/cation ratio is 2:1.



KCl is made up of potassium cations (K+) and chloride anions (Cl-). Since KCl has one potassium cation and one chloride anion, the anion/cation ratio is 1:1.



CsF is also made up of cesium cations (Cs+) and fluoride anions. However, since CsF has one cesium cation and one fluoride anion, the anion/cation ratio is 1:1.



The maximum anion/cation ratio occurs when a compound has the largest number of anions for each cation. In other words, the anion/cation ratio is highest when the compound has the highest possible charge density.

In this case, CsF has the highest anion/cation ratio of 1:1 among the given options. This is because cesium has a larger atomic radius than lithium and potassium, meaning it can accommodate more fluoride anions around it. Additionally, fluoride is a small anion with a high charge density, further increasing the anion/cation ratio in CsF.

Therefore, the correct answer is option (d) CsF.

if you closely look at the oxidation number you will see that ratio will be higher if anions are max and cations least soo for Lil lithium has least positive charge while iodine has highest negative charge because of large amount of electrons so (Lil)...